Magnetic form for use in making molds



March 23, 1954 cfsu zm sK 2,672,664

MAGNETIC FORM FOR USE IN MAK ING MOLDS Filed May 24 1951 EUGENESUDZIARSKI INVENTOR.

2 Sheets-Sheet l March 23, 1954 E. c. SUDZIARSKI MAGNETIC FORM FOR USEIN MAKING MOLDS 2 Sheets-Sheet 2 Filed May 24 1951 lllll lli l/77,711!I/// /7' EUGENE SUDZlARSl fl INVENTORU Patented Mar. 23, 1954 UNITEDSTATES PATENT OFFICE MAGNETIC FORM FOR USE IN MAKING MOLDS Thisinvention relates to the forming or making of molds in metal or otherfoundry work, and

more particularly to forms for forming pouring basins, riser locatorimpressions, etc. in sand molds. Heretofore it has been the practice inthe forming of sand molds to attach the forms for making pouring basins,riser locators or the like in the sand mold, to the squeeze board bybolts so that the forms may be located in various positions on thesqueeze board depending upon the pattern from which the mold is made.This not only requires the employment of squeeze boards having a largenumber of bolt receiving holes therein to allow for the attachment ofthe forms to the board in the location required, but requiringconsiderable labor time consumption in removing the bolts, relocatingthe form and rebolting it to the squeeze board. The useful life of suchsqueeze boards, forms and bolts is comparatively short due to the wearand tear thereon occasioned by the many changes required, particularlyin instances where only a few molds are made at one time from onepattern.

The principal object of the present invention is the provision of formsfor use in making foundry molds which are magnetically attached to thesqueeze board and may be manually removed therefrom and replaced. in anydesired location, completely eliminating the use of bolts and greatlyreducing the labor time required to make the change of location of theforms on the squeeze board. The magnetic forms materially cut down thetime required to make a mold and consequently reduce the cost of moldproduction, and the present invention also increases the useful life ofthe forms and squeeze boards in that the wear and tear as occasioned bychanging the position of bolt attached forms is eliminated.

The use of the present invention not only results in savings to thefoundry operator but enables molders, most of whom work on a pieceworkor incentive scale of wage plan, to make more molds in a given length oftime and consequently increase their wages.

With these and other objects in view, as may appear from theaccompanying specification, the invention-;-.consists of variousfeatures of constructionand. combination of parts, which will be firstdescribed in connection with the accompanying drawings, showing amagnetic form for use in making molds of a preferred form embodying theinvention, and the features forming the invention will be specificallypointed out in the claims,

e d awin s: a

, Figure lis a viewofanordinarytype of tamping sand-mold-forming machinewith a flask thereon which is shown in section to illustrate the mannerin which the squeeze board-carried magnetic forms work.

Figure 2 is a plan view of a magnetic pouringbasin-making formconstructed in accordance with the present invention.

Figure 3 is a cross section through the pouringbasin-making form andtaken on the line 3-3 of Figure 2.

Figure 4 is an enlarged detail view partly in section of thepouring-basin-shaping form.

Figure 5 is a plan view of a modification of the pouring-basin-makingform.

Figure 6 is a side elevation of the modified form shown in Figure 5 ofthe drawings.

Figure '7 is a section through a magnetic riser locatorimpression-making form.

Referring more particularly to the drawings, the molding machinegenerically indicated at A in Figure 1 of the drawings is of anyapproved type of molding machine which may be purchased upon the openmarket and it includes the pattern plate supporting table B and thesqueeze board carrier 0 to which the squeeze board I is attached in theusual manner. In the making of molds, a pattern plate 2 carrying asection of the pattern 3 from which the mold is to be made is placedupon the table B and a flask D of usual construction is placed upon thepattern plate 2 about the pattern, as shown in Figure 1 of the drawings.The pattern 3 includes the pouring riser forming section 4 and theoutlet forming riser 5 as is ordinary in pattern construction. After thepattern and flask have been properly positioned on the table the flaskis filled with sand, shaken down and tamped by the vibration of thetable B, and the swingable head structure E of the molding machine whichcarries the squeeze board I is then moved into position over the flaskand the sand in the flask is then further packed and tamped between thesqueeze board I and the pattern carrier plate 2 in the usual manner. Inthe making of a mold it has become the practice to use forms carried bythe squeeze board I to make the pouring basin shown at 6 and in someinstances a form to make an impression in the mold in alignment with theoutlet riser 5, and it is with such devices that the present inventionis concerned. As hereinabove stated, it has been the general practice toattach pouring basin impression-making form and the riser locatorimpression making form to the squeeze board I by bolts which due to thefact that the position of these forms on the squeeze board must bechanged with every dilferent pattern from which a mold is formed resultsin time-consuming costly labor and reduces the rate of production ofmolds, as well as causing considerable wear on the squeeze boards, boltsand forms, making it necessary to replace the squeeze boards, etc.,quite frequently.

The present invention embodies a combination of squeeze board andimpression-making forms which eliminates'the use of bolts with theircompanionable high labor costs and replacement costs. In carrying outthe present invention, the squeeze board I has a metal plate 10 attachedto its under surface in the event that the squeeze board is made of woodor a metal which is not subject to magnetic attraction.

Figures 2, 3 and 4 show a pouring basinor impression-making form H whichis molded in the desired shape out of any suitable therrno-settingplastic and which has a U-shaped electric magnet lTembedded therein withits opposite polar endsindicated at I3 and Mfiushwith the upperflatisqueezeboard engaging surface of the form II, as clearly shown inFigures 2 and 3 of the drawings so'thatithe magnetic actionof the magnet'lt will hold'the form I i against the squeeze board I in anydesiredposition on the bottom of th'ezsque'eze' board.

Due'to the faotithat there considerable vibration in the operation ofthe molding machinenA "duringthe iormingof a mold, the form H may slip'slightly or slightly alter its position on thefsqueeze'board Ill and toprevent such action a suction cup l.5f-.is'- carried by the mold H.'I'l-iesuction cup '[5 is made'of rubber, synthetic rubber orother-suitable resilient material as is usual in the construction ofordinary type of suction cups, and it maybe attached rigidly to the bodyof'the form H'in any suitable manner. In the'drawinga'however, athreaded stud 16' isshown attached. to'the suction cup i5 and embeddedin the-thermo-setting plastic of which the form made. The'thermo-setting plastic, hardening in the threads of the stud willsecurely-hold the suction: cup in place, or if it is so desired and'ispreferable after the form H has. been molded and seta threaded openingmay be drilled therein into which the stud i6 is threaded for connectingthe suction cup to the form H. As-shown in Figure 4 of the drawings,

the perimetrical 'edge portion of the suction cup i l5 projectsoutwardly from'the' flat squeeze board engaging the face [I of theformil when the tennis not attached to the squeeze board and when the. form.is attached'to the squeeze board by means of the magnet l2 the suctioncup is: slightly deformed as shown in Figure 3 of the drawings so thatits perimetrical portion is flush with the face H of the form and is inengagement with theilower face of the squeeze board I to provide asuction binding action to hold the form I 1 against accidentaldisplacement during the vibration of the mold-forming machine.

In Figures 2 and 3' of the drawings a single magnet I2 is shown embeddedin the body of the form I and this magnet-extends along the longest ofthe form. Also a single suctioncup l5 isshown in this form of theinvention. It is to be understood, however, that various locations ofthe magnet, various numbers of magnets and various numbers of suctioncups. may be employed. to meet the. requirements of holding :theimpressione'making .form :firmly inplace on thesquecze board. .InFigures 5.:and

6 of the drawings one such modification of the invention is shown.

In Figures 5 and 6 a plurality of horseshoe magnets are embedded in theform H and they extend crosswise of the form. Each of the magnets 20 hasits opened polar ends exposed at the fiat face of the form H which is toengage the squeeze board, the same as the form shown in Figures 2 to 4inclusive. In the form shown in Figures 5 and 6, a plurality of suctioncups 22 are shown which are identical with the suctioncups 1:5 andoperate in the same manner.

In Figure '7 of the drawings a magnetic form is shown which is providedfor the purpose of making an outlet-riser locating impression in thepouring side of the mold, such impression being shown at 23 in Figure 1of the drawings. The form 24 is made in the same manner as the form N,that is, it is-preferablymolded from a thermosettingplastic, although ifit is so desired the forms H and 2 1 may be molded of any suitablematerial which will: not deflect magnetic current flow of the magnetsembedded in the forms.

The riser locator impression making form 26 has a magnet'ZSembeddedtherein, the opposed polar ends ofwhicl'rmagnet are flush with the flatsqueeze board-engaging surface 26 of the form and are exposed'so thatthe form 24 may be magnetically attached to the'squeeze board. In Figure7, the form. 241s shown as not having a suction cup carried thereby, butitis to be understood that if'it is desired or necessary, a suction cupsuch as the cup 1'5 may be attached tothe form .24 in theisame manner asthe suction cup i5 is attached to theform II.

It will be .noted in'Figure 4. of the drawings that a portion of theform H is cut away or rounded out'as shown at 1-8 to receive theperimetrical portion ofthe suction cup 15 when it is deformed duringattachment to the squeeze board.

It is to be understood,:of course, that the magnets 12, '20 and havesufiicient magnetic strength to hold the forms firmly against thesqueeze boardbutpermit the form to be manually removed forrelocation onthe squeeze board.

It will be understood that the invention is not to be limited to thespecific construction or arrangement *of parts shown, but that they maybe widely modified within the invention defined by the claims.

What is claimed is:

1. In a molding'machine for forming pouring basins, riser locatorimpressions and the like in molding materials including, a squeeze boardhaving a magnetizable sheet thereon and adapted to be moved towards andaway from said molding materials, and a pattern having a seating faceand an impression-making exterior face, said pattern. having magneticmeans embedded therein with the polar ends thereof flush with andexposed at said seating face to removably mount the pattern atany pointon said magnetizable sheet.

2. In a moldingmachine .for forming pouring basins, riser locatorimpressions and the like in molding materials including, a squeeze boardhaving a magnetizable sheet thereon and adapted to be moved towards andaway from said molding materials, and a non-distortionable patternhaving a seating face and an impression making exterior face, saidpattern having magnetic embedded means therein with the polar endsthereof flush with and exposed 'at said seating face to 5 removablymount the pattern at any point on said magnetizable sheet.

3. In a molding machine for forming pouring basins, riser locatorimpressions and the like in molding materials including, a squeeze boardhaving a magnetizable sheet thereon and adapted to be moved towards andaway from said molding materials, and a pattern having a seating faceand an impression-making exterior face,

said pattern having magnetic means embedded 10 therein with the polarends thereof flush with and exposed at said seating face to removablymount the pattern at any point on said magnetizable sheet, and at leastone suction cup carried by said pattern to provide a suction action 15between the pattern and said magnetiz'able sheet,

5 will deform to provide a firm suction action.

EUGENE C. SUDZIARSKI.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,127,095 Sands Feb. 2, 1915 1,598,559 Cohen Aug. 31, 19261,641,880 Cohen Sept. 6, 1927 1,680,502 Craig et a1 Aug. 14, 19282,524,737 Sawyer Oct. 3, 1950

